Blue, am I in beta? :[

I was clicking around Battle net today to see if i could find my order history for my blizzcon ticket and I noticed that in my Manage Games tab, I had a title called World of Warcraft : Cataclysm Beta, but underneath it says PTR. Is this a beta client or just a link to download the public test realm thing?

I dont remember getting an email but it might have landed in spam.

Any help much appreciated... thank you!